LU-12022 tests: error on resync failure sanity-flr

LU-12022 tests: error on resync failure sanity-flr

In sanity-flr test 200, we should error if the final resync
fails.  Replace all calls to 'mirror_io resync' that does
not inject an error to  '$LFS mirror resync'.

Lustre-change: https://review.whamcloud.com/35754
Lustre-commit: 9e1e29406c3886bce0db6623be40d3edf6834117

Test-Parameters: trivial testlist=sanity-flr
Signed-off-by: James Nunez <jnunez@whamcloud.com>
Change-Id: I9b2ec1beb7060086808b7529467bef80c8e9659f
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Emoly Liu <emoly@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/47617
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>